Dawn Pentagon misses goal for missile defence system| WASHINGTON, Dec 31: The Pentagon failed to meet its goal of declaring a missile defence system operational in 2004 and critics said failures in testing the ambitious system show it simply does not w... (photo: Alex Wong/WorldPhotos.com)

BBC News Huygens probe unleashed on TitanThe Huygens probe has been released and is heading for Saturn's largest moon, Titan, scientists have confirmed. | A signal that the robot lab had separated from its mothership, Cassini, was received b... (photo: NASA/JPL/Space Science Institute)AstronomerPhotosScienceUSWkd